Sea ice extent in Alaskan Arctic

Updated on June 24, 2025

Alaskan Arctic

The time series plot and data below present statistics on sea ice extent within Alaskan Arctic.

Plots are interactive!
  • To zoom in and out, reset or download the plot, hover on the plot to see the option on the top right corner.
  • To turn on and off data series, click on the data series title in the legend located below each plot.

Sea ice extent daily time series

Data: Sea ice extent was computed by PolarWatch using NOAA/NSIDC daily sea ice concentration data at a 25km resolution

Sea ice extent anomalies

Users can click on the data names in the legend to toggle it on and off.

Data: Sea ice extent anomalies were computed by PolarWatch using NOAA/NSIDC daily sea ice concentration data at a 25km resolution

Annualized Sea ice extent time series (1985-2024)

Data: Sea ice extent anomalies were computed by PolarWatch using NOAA/NSIDC monthly sea ice concentration data at a 25km resolution

Data and Methods

The data sources and calculation methods can be found on the methods page. (Methods).

Data Disclaimer

The extent values for this year are computed using near real-time data, while the science-quality data (Climate Data Record, or CDR) is still being processed and will be available at a later time.

Data may be missing or corrupted in the event of technical failures with sensors or ground stations.

Please check the data log or contact us at sun.bak-hospital@noaa.gov for further information.

Daily Sea ice extent data downloads

  • Baseline daily extent time series (1991-2020) Data - Metadata
  • Near-real-time daily extent of two recent years Data - Metadata
  • Annual mean extent time series (1985-2024) Data - Metadata
  • Daily sea ice concentration from near-real-time (NRT) Link to Portal
  • Daily sea ice concentration from Climate Data Record (CDR) Link to Portal

More resources

NOAA’s Annual Arctic Report Card